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<div class="title">base.c</div>  </div>
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<a href="a00608.html">浏览该文件的文档.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160; </div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="a03629.html">precomp.h</a>&quot;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#pragma hdrstop</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160; </div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#include &lt;ntddbeep.h&gt;</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160; </div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160; </div>
<div class="line"><a name="l00030"></a><span class="lineno"><a class="line" href="a00608.html#a9174085945bf93cc61fef7e307c22901">   30</a></span>&#160;<span class="keywordtype">int</span> <a class="code" href="a00608.html#a9174085945bf93cc61fef7e307c22901">RtlLoadStringOrError</a>(</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    <a class="code" href="a03608.html#afd1a0e78d1f88954d93e48ab3821781f">UINT</a> wID,</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;    LPWSTR lpBuffer,            <span class="comment">// Unicode buffer</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;    <span class="keywordtype">int</span> cchBufferMax,           <span class="comment">// cch in Unicode buffer</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;    WORD wLangId)</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;{</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    PMESSAGE_RESOURCE_ENTRY MessageEntry;</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;    <span class="keywordtype">int</span> cch;</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;    NTSTATUS Status;</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160; </div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment">     * Make sure the parms are valid.</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;    <span class="keywordflow">if</span> (!lpBuffer || (cchBufferMax-- == 0))</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;        <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160; </div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    cch = 0;</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160; </div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    Status = RtlFindMessage((PVOID)<a class="code" href="a03257.html#a4ae1966258068576cf2be4cc7356924b">hModuleWin</a>, (ULONG)RT_MESSAGETABLE,</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;            wLangId, wID, &amp;MessageEntry);</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;    <span class="keywordflow">if</span> (NT_SUCCESS(Status)) {</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160; </div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;        <span class="comment">/*</span></div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="comment">         * Copy out the message.  If the whole thing can be copied,</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment">         * copy two fewer chars so the crlf in the message will be</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="comment">         * stripped out.</span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="comment">         */</span></div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;        cch = wcslen((PWCHAR)MessageEntry-&gt;Text) - 2;</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;        <span class="keywordflow">if</span> (cch &gt; cchBufferMax)</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;            cch = cchBufferMax;</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160; </div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;        RtlCopyMemory(lpBuffer, (PWCHAR)MessageEntry-&gt;Text, cch * <span class="keyword">sizeof</span>(WCHAR));</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;    }</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160; </div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment">     * Append a NULL.</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;    lpBuffer[cch] = 0;</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160; </div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    <span class="keywordflow">return</span> cch;</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;}</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160; </div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160; </div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160; </div>
<div class="line"><a name="l00083"></a><span class="lineno"><a class="line" href="a00899.html#a6c96372198152be76c02728ab8e49dce">   83</a></span>&#160;VOID <a class="code" href="a00608.html#a6c96372198152be76c02728ab8e49dce">UserSleep</a>(</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    <a class="code" href="a00563.html#a074685e97e89d6aa2accdfcb82328699">DWORD</a> dwMilliseconds)</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;{</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    LARGE_INTEGER TimeOut;</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160; </div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    TimeOut.QuadPart = Int32x32To64( dwMilliseconds, -10000 );</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    KeDelayExecutionThread(UserMode, FALSE, &amp;TimeOut);</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;}</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160; </div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160; </div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160; </div>
<div class="line"><a name="l00102"></a><span class="lineno"><a class="line" href="a00899.html#af5893e53f677c0f2acc765c8b47fa12a">  102</a></span>&#160;BOOL <a class="code" href="a00608.html#af5893e53f677c0f2acc765c8b47fa12a">UserBeep</a>(</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;    <a class="code" href="a00563.html#a074685e97e89d6aa2accdfcb82328699">DWORD</a> dwFreq,</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;    <a class="code" href="a00563.html#a074685e97e89d6aa2accdfcb82328699">DWORD</a> dwDuration)</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;{</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;    OBJECT_ATTRIBUTES ObjectAttributes;</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;    UNICODE_STRING NameString;</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    NTSTATUS Status;</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    IO_STATUS_BLOCK IoStatus;</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;    BEEP_SET_PARAMETERS BeepParameters;</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;    HANDLE hBeepDevice;</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;    LARGE_INTEGER TimeOut;</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160; </div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;    CheckCritOut();</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160; </div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;    RtlInitUnicodeString( &amp;NameString, DD_BEEP_DEVICE_NAME_U );</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;    InitializeObjectAttributes( &amp;ObjectAttributes,</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;                                &amp;NameString,</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;                                0,</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;                                NULL,</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;                                NULL</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;                              );</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;    Status = ZwCreateFile( &amp;hBeepDevice,</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;                           FILE_READ_DATA | FILE_WRITE_DATA,</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;                           &amp;ObjectAttributes,</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;                           &amp;IoStatus,</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;                           NULL,</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;                           0,</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;                           FILE_SHARE_READ | FILE_SHARE_WRITE,</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;                           FILE_OPEN_IF,</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;                           0,</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;                           (PVOID) NULL,</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;                           0L</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;                         );</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;    <span class="keywordflow">if</span> (!NT_SUCCESS( Status )) {</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;        <span class="keywordflow">return</span>( FALSE );</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;        }</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160; </div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;<span class="comment">     * 0,0 is a special case used to turn off a beep.  Otherwise</span></div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;<span class="comment">     * validate the dwFreq parameter to be in range.</span></div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;    <span class="keywordflow">if</span> ((dwFreq != 0 || dwDuration != 0) &amp;&amp;</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;        (dwFreq &lt; (ULONG)0x25 || dwFreq &gt; (ULONG)0x7FFF)</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;       ) {</div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;        Status = STATUS_INVALID_PARAMETER;</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;        }</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;    <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;        BeepParameters.Frequency = dwFreq;</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;        BeepParameters.Duration = dwDuration;</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160; </div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;        Status = ZwDeviceIoControlFile( hBeepDevice,</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;                                        NULL,</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;                                        NULL,</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;                                        NULL,</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;                                        &amp;IoStatus,</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;                                        IOCTL_BEEP_SET,</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;                                        &amp;BeepParameters,</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;                                        <span class="keyword">sizeof</span>( BeepParameters ),</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;                                        NULL,</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;                                        0</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;                                      );</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;        }</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160; </div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;    <a class="code" href="a00899.html#ae451a2dc8791c420d7c956a63adc33ba">EnterCrit</a>();</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;    <a class="code" href="a00599.html#a47af503ea2c52aebdffe8c960b8249fd">_UserSoundSentryWorker</a>(0);</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;    <a class="code" href="a00899.html#ac2181d07596893ed44d18aa267ce4d23">LeaveCrit</a>();</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160; </div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;    <span class="keywordflow">if</span> (!NT_SUCCESS( Status )) {</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;        ZwClose( hBeepDevice );</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;        <span class="keywordflow">return</span>( FALSE );</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;    } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;        <span class="comment">/*</span></div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;<span class="comment">         * Beep device is asynchronous, so sleep for duration</span></div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;<span class="comment">         * to allow this beep to complete.</span></div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;<span class="comment">         */</span></div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;        <span class="keywordflow">if</span> (dwDuration != (<a class="code" href="a00563.html#a074685e97e89d6aa2accdfcb82328699">DWORD</a>)-1 &amp;&amp; (dwFreq != 0 || dwDuration != 0)) {</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;            TimeOut.QuadPart = Int32x32To64( dwDuration, -10000 );</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;            <span class="keywordflow">do</span> {</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;                Status = KeDelayExecutionThread(UserMode, FALSE, &amp;TimeOut);</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;            }</div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;            <span class="keywordflow">while</span> (Status == STATUS_ALERTED);</div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;        }</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;    ZwClose( hBeepDevice );</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;    <span class="keywordflow">return</span>( TRUE );</div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;    }</div>
<div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;}</div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160; </div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160; </div>
<div class="line"><a name="l00198"></a><span class="lineno"><a class="line" href="a00899.html#aa0553738b3b03816a062ca25b5c3ad4e">  198</a></span>&#160;<span class="keywordtype">int</span> <a class="code" href="a00608.html#aa0553738b3b03816a062ca25b5c3ad4e">UserMulDiv</a> (</div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;    <span class="keywordtype">int</span> nNumber,</div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;    <span class="keywordtype">int</span> nNumerator,</div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;    <span class="keywordtype">int</span> nDenominator</div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;    )</div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;{</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;    ULONG Divisor;</div>
<div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;    LONG Negate;</div>
<div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;    LARGE_INTEGER Product;</div>
<div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;    ULONG Quotient;</div>
<div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;    ULONG Remainder;</div>
<div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;    LONG Result;</div>
<div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160; </div>
<div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;<span class="comment">     * If the denominator is zero, then return a value of minus one.</span></div>
<div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;    <span class="keywordflow">if</span> (nDenominator == 0) {</div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;        <span class="keywordflow">return</span> - 1;</div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;    }</div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160; </div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;<span class="comment">     * Compute the 64-bit product of the multiplier and multiplicand</span></div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;<span class="comment">     * values.</span></div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;    Product.QuadPart = Int32x32To64(nNumber, nNumerator);</div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160; </div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;<span class="comment">     * Compute the negation value and convert the numerator and the denominator</span></div>
<div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;<span class="comment">     * to positive values.</span></div>
<div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;    Negate = nDenominator ^ Product.HighPart;</div>
<div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;    <span class="keywordflow">if</span> (nDenominator &lt; 0) {</div>
<div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;        nDenominator = - nDenominator;</div>
<div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;    }</div>
<div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160; </div>
<div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;    <span class="keywordflow">if</span> (Product.HighPart &lt; 0) {</div>
<div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;        Product.LowPart = (ULONG)(- (LONG)Product.LowPart);</div>
<div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;        <span class="keywordflow">if</span> (Product.LowPart != 0) {</div>
<div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;            Product.HighPart = ~Product.HighPart;</div>
<div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160; </div>
<div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;        } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;            Product.HighPart = - Product.HighPart;</div>
<div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;        }</div>
<div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;    }</div>
<div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160; </div>
<div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;<span class="comment">     * If there are any high order product bits, then the quotient has</span></div>
<div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;<span class="comment">     * overflowed.</span></div>
<div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;    Divisor = (ULONG)nDenominator;</div>
<div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;    Quotient = (ULONG)Product.LowPart;</div>
<div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;    Remainder = (ULONG)Product.HighPart;</div>
<div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;    <span class="keywordflow">if</span> (Divisor &lt;= Remainder) {</div>
<div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;        <span class="keywordflow">return</span> - 1;</div>
<div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;    }</div>
<div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160; </div>
<div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;<span class="comment">     * Divide the 64-bit product by the 32-bit divisor forming a 32-bit</span></div>
<div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;<span class="comment">     * quotient and a 32-bit remainder.</span></div>
<div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;<span class="preprocessor">#ifdef _X86_</span></div>
<div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160; </div>
<div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;    _asm {</div>
<div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;            mov edx,Remainder</div>
<div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;            mov eax,Quotient</div>
<div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;            div Divisor</div>
<div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160;            mov Remainder,edx</div>
<div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;            mov Quotient,eax</div>
<div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;        }</div>
<div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160; </div>
<div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;<span class="preprocessor">#else</span></div>
<div class="line"><a name="l00269"></a><span class="lineno">  269</span>&#160; </div>
<div class="line"><a name="l00270"></a><span class="lineno">  270</span>&#160;    Quotient = RtlEnlargedUnsignedDivide(*(PULARGE_INTEGER)&amp;Product,</div>
<div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;                                        Divisor,</div>
<div class="line"><a name="l00272"></a><span class="lineno">  272</span>&#160;                                        &amp;Remainder);</div>
<div class="line"><a name="l00273"></a><span class="lineno">  273</span>&#160; </div>
<div class="line"><a name="l00274"></a><span class="lineno">  274</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00275"></a><span class="lineno">  275</span>&#160; </div>
<div class="line"><a name="l00276"></a><span class="lineno">  276</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160;<span class="comment">     * Round the result if the remainder is greater than or equal to one</span></div>
<div class="line"><a name="l00278"></a><span class="lineno">  278</span>&#160;<span class="comment">     * half the divisor. If the rounded quotient is zero, then overflow</span></div>
<div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160;<span class="comment">     * has occured.</span></div>
<div class="line"><a name="l00280"></a><span class="lineno">  280</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00281"></a><span class="lineno">  281</span>&#160;    <span class="keywordflow">if</span> (Remainder &gt;= ((Divisor + 1) &gt;&gt; 1)) {</div>
<div class="line"><a name="l00282"></a><span class="lineno">  282</span>&#160;        Quotient += 1;</div>
<div class="line"><a name="l00283"></a><span class="lineno">  283</span>&#160;        <span class="keywordflow">if</span> (Quotient == 0) {</div>
<div class="line"><a name="l00284"></a><span class="lineno">  284</span>&#160;            <span class="keywordflow">return</span> - 1;</div>
<div class="line"><a name="l00285"></a><span class="lineno">  285</span>&#160;        }</div>
<div class="line"><a name="l00286"></a><span class="lineno">  286</span>&#160;    }</div>
<div class="line"><a name="l00287"></a><span class="lineno">  287</span>&#160; </div>
<div class="line"><a name="l00288"></a><span class="lineno">  288</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00289"></a><span class="lineno">  289</span>&#160;<span class="comment">     * Compute the final signed result.</span></div>
<div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00291"></a><span class="lineno">  291</span>&#160;    Result = (LONG)Quotient;</div>
<div class="line"><a name="l00292"></a><span class="lineno">  292</span>&#160;    <span class="keywordflow">if</span> (Negate &gt;= 0) {</div>
<div class="line"><a name="l00293"></a><span class="lineno">  293</span>&#160;        <span class="keywordflow">if</span> (Result &gt;= 0) {</div>
<div class="line"><a name="l00294"></a><span class="lineno">  294</span>&#160;            <span class="keywordflow">return</span> Result;</div>
<div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160; </div>
<div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;        } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00297"></a><span class="lineno">  297</span>&#160;            <span class="keywordflow">return</span> - 1;</div>
<div class="line"><a name="l00298"></a><span class="lineno">  298</span>&#160;        }</div>
<div class="line"><a name="l00299"></a><span class="lineno">  299</span>&#160; </div>
<div class="line"><a name="l00300"></a><span class="lineno">  300</span>&#160;    } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00301"></a><span class="lineno">  301</span>&#160;        <span class="keywordflow">if</span> ((Result &gt;= 0) || ((Result &lt; 0) &amp;&amp; (Quotient == 0x80000000))) {</div>
<div class="line"><a name="l00302"></a><span class="lineno">  302</span>&#160;            <span class="keywordflow">return</span> - Result;</div>
<div class="line"><a name="l00303"></a><span class="lineno">  303</span>&#160; </div>
<div class="line"><a name="l00304"></a><span class="lineno">  304</span>&#160;        } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00305"></a><span class="lineno">  305</span>&#160;            <span class="keywordflow">return</span> - 1;</div>
<div class="line"><a name="l00306"></a><span class="lineno">  306</span>&#160;        }</div>
<div class="line"><a name="l00307"></a><span class="lineno">  307</span>&#160;    }</div>
<div class="line"><a name="l00308"></a><span class="lineno">  308</span>&#160;}</div>
<div class="line"><a name="l00309"></a><span class="lineno">  309</span>&#160; </div>
<div class="line"><a name="l00310"></a><span class="lineno"><a class="line" href="a00899.html#a2f03d318ac2c5bd1f77147cebddfaf75">  310</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="a00608.html#a2f03d318ac2c5bd1f77147cebddfaf75">RtlInitUnicodeStringOrId</a>(</div>
<div class="line"><a name="l00311"></a><span class="lineno">  311</span>&#160;    PUNICODE_STRING pstrName,</div>
<div class="line"><a name="l00312"></a><span class="lineno">  312</span>&#160;    LPWSTR lpstrName)</div>
<div class="line"><a name="l00313"></a><span class="lineno">  313</span>&#160;{</div>
<div class="line"><a name="l00314"></a><span class="lineno">  314</span>&#160;    <span class="keywordflow">if</span> (HIWORD(lpstrName)) {</div>
<div class="line"><a name="l00315"></a><span class="lineno">  315</span>&#160;        RtlInitUnicodeString(pstrName, lpstrName);</div>
<div class="line"><a name="l00316"></a><span class="lineno">  316</span>&#160;    } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00317"></a><span class="lineno">  317</span>&#160;        pstrName-&gt;Length = pstrName-&gt;MaximumLength = 0;</div>
<div class="line"><a name="l00318"></a><span class="lineno">  318</span>&#160;        pstrName-&gt;Buffer = lpstrName;</div>
<div class="line"><a name="l00319"></a><span class="lineno">  319</span>&#160;    }</div>
<div class="line"><a name="l00320"></a><span class="lineno">  320</span>&#160;}</div>
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<div class="ttc" id="aa00899_html_ac2181d07596893ed44d18aa267ce4d23"><div class="ttname"><a href="a00899.html#ac2181d07596893ed44d18aa267ce4d23">LeaveCrit</a></div><div class="ttdeci">VOID LeaveCrit(VOID)</div></div>
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